WJdiag (Pro & Free) — Android diagnostics for Jeep Grand Cherokee WJ/WG 
What it does
WJdiag is a focused scan-tool app for Jeep Grand Cherokee WJ/WG (2002–2004), especially the 2.7 CRD. Paired with a quality Bluetooth ELM327 adapter, it reads/clears faults, streams live data with logging, runs module tests and exposes selected coding tasks that generic scanner apps often miss.
Free vs Pro
Supported control modules (highlights)
ECM (2.7 CRD), TCM (2.7 CRD), ABS, Airbag, SKIM immobilizer, Body Computer, Automatic Temp Control, Driver/Passenger Door, Instrument Cluster, Overhead Console, Navigation/Radio/CD changer, Park Assist, Rain Sensor, Adjustable Pedal, Hands-Free and others (support varies by trim and year).
Pro features you’ll actually use
Quick start
Compatibility
• Vehicles: Jeep Grand Cherokee WJ/WG 2002–2004 (full feature set on 2.7 CRD; most body/comfort modules on gasoline/3.1 diesel may also be accessible).
• Protocols: ISO 9141-2/K-Line and J1850 (use a proven, genuine-chip ELM327; many clones struggle).
• OS: Android 5.0 and newer (phones or tablets).
Minimum requirements (suggested)
File notes
Included builds may appear as: WJdiag Free (.XAPK, e.g., v21.0) and WJdiag Pro (.APK, e.g., v12.0).
Use responsibly for legitimate diagnosis, maintenance and repairs. Always follow local regulations and service procedures. Coding/features depend on vehicle equipment and adapter quality.
Tested environment
Verified on Android 13/12 devices with a genuine-chip ELM327; designed to operate on Android 5.0–14.
Disclaimer
This summary is compiled from publicly available information for educational/archival purposes. Any files referenced are hosted by third parties and were uploaded by unknown users; our community does not claim ownership. Contact us if you are a rights holder and we will assist promptly.
What it does
WJdiag is a focused scan-tool app for Jeep Grand Cherokee WJ/WG (2002–2004), especially the 2.7 CRD. Paired with a quality Bluetooth ELM327 adapter, it reads/clears faults, streams live data with logging, runs module tests and exposes selected coding tasks that generic scanner apps often miss.
Free vs Pro
- WJdiag Free — quick health check for 2.7 CRD: read/clear Engine (ECM) and Gearbox (TCM) DTCs, basic ECU info. Ideal to verify your ELM327 before upgrading.
- WJdiag Pro — extended access across modules: Fault Codes with descriptions, Freeze Frame, Live Data (with CSV logging), Input/Output monitors, service tests and selected coding (where supported).
Supported control modules (highlights)
ECM (2.7 CRD), TCM (2.7 CRD), ABS, Airbag, SKIM immobilizer, Body Computer, Automatic Temp Control, Driver/Passenger Door, Instrument Cluster, Overhead Console, Navigation/Radio/CD changer, Park Assist, Rain Sensor, Adjustable Pedal, Hands-Free and others (support varies by trim and year).
Pro features you’ll actually use
- Engine (ECM): read/clear DTCs with explanations, Freeze Frame; up to dozens of engine PIDs with logging; I/O map (switches, relays, EGR, fans); injector test/coding on 2.7 CRD.
- Transmission (TCM): DTCs + Freeze Frame; live PIDs with logging; I/O for solenoids and gear state; shifter/transfer-case signals monitoring.
- ABS/Cluster/Body modules: DTCs, live data + logging, I/O; useful tests like gauge sweep; speedometer correction via Pinion Factor (where available).
Quick start
- Pair a reliable Bluetooth ELM327 (PIN usually 1234) and put ignition to ON.
- Open WJdiag, connect, and select your module.
- Choose Fault Codes, Live Data, I/O or Tests; enable logging to export CSV if needed.
Compatibility
• Vehicles: Jeep Grand Cherokee WJ/WG 2002–2004 (full feature set on 2.7 CRD; most body/comfort modules on gasoline/3.1 diesel may also be accessible).
• Protocols: ISO 9141-2/K-Line and J1850 (use a proven, genuine-chip ELM327; many clones struggle).
• OS: Android 5.0 and newer (phones or tablets).
Minimum requirements (suggested)
- Android 5.0+
- Bluetooth-capable device
- Quality ELM327 adapter
- ~10–50 MB free storage for app + logs
File notes
Included builds may appear as: WJdiag Free (.XAPK, e.g., v21.0) and WJdiag Pro (.APK, e.g., v12.0).
Use responsibly for legitimate diagnosis, maintenance and repairs. Always follow local regulations and service procedures. Coding/features depend on vehicle equipment and adapter quality.
Tested environment
Verified on Android 13/12 devices with a genuine-chip ELM327; designed to operate on Android 5.0–14.
Disclaimer
This summary is compiled from publicly available information for educational/archival purposes. Any files referenced are hosted by third parties and were uploaded by unknown users; our community does not claim ownership. Contact us if you are a rights holder and we will assist promptly.
